Method and apparatus for identifying a fault in a communications link

Inactive Publication Date: 2008-01-03
TELLABS PETALUMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This creates a link fault that is detected by a second network device on a transmit side of the communications link.

Method used

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  • Method and apparatus for identifying a fault in a communications link
  • Method and apparatus for identifying a fault in a communications link
  • Method and apparatus for identifying a fault in a communications link

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Embodiment Construction

[0011]A description of example embodiments of the invention follows.

[0012]In optical Ethernet networks, methods to detect receiver side link loss on a transmit side of the network are complicated and expensive. Example embodiments of the present invention can accomplish informing a network node on the transmit side of a network link by disabling communications from a network node on a receive side of the network link to the network node on the transmit side of the communications link. The network node on the transmit side of the communications link detects the receiver side loss through this indirect technique and works within existing protocols of network nodes. Example embodiments of the invention can work on all optical Ethernet interfaces regardless of speed and is less expensive than employing more expensive optical transmitters.

[0013]FIG. 1 is a network diagram 100 illustrating a network in which example embodiments of the present invention may be employed. A network cloud 102...

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Abstract

In optical Ethernet networks, receiver side link loss is not known on a transmitter side network element, and a transmitter at a receiver side network element does not know of the receiver side link loss without special, very expensive, optical transmitters or a Gigabit Media Independent Interface (GMII). Example embodiments of the present invention can accomplish informing a network node on the transmit side of a network link by disabling communications from a network node on a receive side of the network link to the network node on the transmit side of the communications link. The network node on the transmit side of the communications link detects the receiver side loss through this indirect technique and works within existing protocols of network nodes. Example embodiments can work on all optical Ethernet interfaces regardless of speed and is less expensive than employing optical transmitters designed to detect receiver side link loss.

Description

BACKGROUND OF THE INVENTION[0001]Receiver side link loss is not known on a transmitter side network element, and a transmitter at a receiver side network element does not know of the receiver side link loss without special, very expensive, optical transmitters or a Gigabit Media Independent Interface (GMII), referred to herein as a GMII interface.[0002]A GMII interface can detect receiver side link loss and inform a transmitter in the receiver side network element of the link loss for notifying the transmitter side network element. Expensive optical transmitters may have diagnostic capabilities, but most use lower cost and more widely available commodity parts that do not have this capability.SUMMARY OF THE INVENTION[0003]An embodiment of the present invention is a method and corresponding apparatus for identifying a fault in a communications link. A first network device on a receive side of a communications link disables transmit direction communications on the communications link ...

Claims

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Application Information

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IPC IPC(8): H04J1/16
CPCH04L41/069H04Q3/0079H04L43/0811H04L43/065
InventorCOLE, MARK W.BAL, NURETTINLOPEZ, RICHARD S.
OwnerTELLABS PETALUMA